Tire tube



Feb; ze, 19% 11,484,625

T. J. COOPER TIRE TUBE Filed Feb. 28. 1921 i l 7g3 70 7 `9 V 1 77 Y2 l 20 n. 22 2 79 il 3\ Z7 y f2 la @Moz "m Fatenteel Feb. 23, 192% nutrir STAFF@ THOMAS J. COOPER, 0F PATERSON, NEW JERSEY.

TIRE TUBE.

Application led February 23. 1921. Serial No. 449,371.

To all whom t may concern:

.Be it known that 1, THOMAS J. Coornn, a citizen of the United States, residing'at Paterson, in the county of Passaic and State of New Jersey, have invented certain new and useful improvements in 'llire r1`ubes; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to inner tubes for pneumatic tires.

Among the objects of my invention are:

To produce an inner tube having a plurality of compartments for the reception of l air under pressure.

'llhere are many forms in which my improved tube may be constructed, one form eing shown in the accompanying drawings, in which: c

Figure 1 is a cross section of a elly, rim, shoe and my ,improved inner tube.

Fig. 2 is an enlarged view of a valve used in my improved inner tube when viewed in the direction of the arrow 2 in Fig. 1.

Fig. 3 is a view of the same valve viewed in the direction of the arrow 3 in Fig. 1.

Fig. i is a view of my improved tube lopking inthe direction of the arrow 4 in 1n the drawings:

5, 6 and 7 are, respectively, the usual felly, rim and shoe, and 8 isy the usual valve. All of these parts are of the ordinary or any approved construction.

9 is my improved inner tube having the wall 10 preferably circular in cross section and formed in the formv of a ring to fit snugly in the shoe 7 'in the same manner as the ordinary inner tube fits within its corresponding shoe.

My improved inner tube is divided into compartments by the septa 11 and 12. The septa 11 and 12 extend completely around the interior of the inner tube, thus forming the compartment 13 adjacent to the rim 6 and compartments 14 and 15 adjacent to the tread of the shoe 7. The compartments 14 and 15 extend completely around the interior of the inner tube and each of said compartments may be divided into a plurality of non-communicating short compartments by septa such as lfd-13. rlhe septa 16,-16 may be omitted, if desired.

ln order to provide for communication from the compartment 13 to the compartments 14 and 15, 1 provide passageways such as 17 and 18 having circular recesses such as 19 and 20, respectively, in which rest the valves 21 and 22, respectively.

As shown in Fig. 3, a plurality of holes such as 23 extends from the compartment 15 to the recess 20. A similar plurality of `holes extends from the compartment 14 to the recess 19.

My improved inner tube is inated by applying an air pump to the valve 8 and pumping air through said valve into the compartment 13. IThe air then passes through the passageways 17 and 18 into the recesses 19 and 20, respectively, then from the latter through the holes 23 to the compartment 15.' Similarly the air also passes :from the recess 19 through holes similar to 23 in the compartment 14. Thus when the compartment 13 is inflated, the compartments 14 and 15 are also inflated with air at the same pressure.

My inner tube being inflated it operates in substantially the same manner as the ordinary inner tube with this important difference :-Owing to the support adorded to the shoe 7 at the tread portion 24 by the septa 11 and 12, it follows that considerably less air pressure is required in the interior of my improved tube than is required in the interior yof the ordinary inner tube. Consequently, there is less bursting stress upon the shoe 7 and greater life of said shoe and greater resiliency thereof is obtained.

if the shoe 7 should become detached at one portion of its extent from the rim 6, the wall 10 will blow out at the region of detachment, or if a puncture occur in said wall thus deating the compartment 13. When this happens, the pressure of the air within the compartments 14C and 15 will raise the valves 21 and 22, respectively, thus closing the passageways 17 and 18, thus pre y venting the escape of air from said compartments.

My im roved inner tube is thus but partially de ated by a blow out from the compartment 13 and the other compartments will 'afford suiicient support to prevent the cutting of the shoe 7.

Should a puncture occur in leither of the compartments 14 or 15, it will act to deflate partments 14 nor any of the compartments 15.

Hence it is apparent that I am enabled to provide an inner tube which cannot be totally deflated by either a blow-out or a puncture.

It is, of course, to be understood that each of the compartments 14 and 15 is to be provided with a separate passageway such as 17 and with a separate valve such as 19. If the septa 16-16 are not used, then but one valve is required `between the compartment 13 and the compartment 14 and one valve between the compartment 13 and the compartment 15.

It is to be noted that I have the large compartment 13 adjacent to the rim 6 and the small compartments 14 and 15 adjacent to the thread portion 24 of the shoe 7. I prefer this construction because it gives greater insurance against deflation by punctures and enables me to use a less pressure of air, owing to the support of said tread portion by the septa 11 and 12.

I claim In a tire formed as a ring shaped tube, a continuous cylindrical septum within said tube, the ends of said septum having air tight unions with said tube, and a single continuous annular septum within said tube, one edge of vsaid annular septum having an air tight union with saidcylindrical septum and the other edge of said annular septum having an air tight union with said tube around the interior surface thereof having the longer radius of curvature, said septa being so disposed that stresses upon the tread of said tire are transmitted by said annular septum to said cylindrical septum and `are partly resisted by the transverse resistance of said cylindrical septum.

In testimony whereof, I affix my signature.

THOMAS J. COOPER. 

